I think good radio often uses the techniques of fiction: characters, scenes, a big urgent emotional question. And as in the best fiction, tone counts for a lot. ↗
When they do bring on new people, it's good for the show. It's like getting a new toy. The writers enjoy it because it's a whole new character that they can write for, one that they aren't used to writing for. They can try different things. ↗
In designing hardware to be used every day, it was important to keep both the human aspects and the machine in mind. What looks good also often feels good. ↗